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If n is an even natural number and coeff...

If n is an even natural number and coefficient of `x^r` in the expansion of `((1+x)^n)/(1-x)` is `2^n` then (A) `rgt(n/2)` (B) `rgeq((n-2)/2)` (C) `rleq((n+2)/2)` (D) `rgeqn`

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